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when using python logging.Formatter() can I use a pep8 style or does it have to be on one line

March 25, 2022

I’m learning how to use the python logging module and wanted to know if it’s possible to split the code below so the variables are easily readable and identified:

formatter_f = logging.Formatter('%(asctime)s,%(levelname)s,%(module)s,%(funcName)s,%(message)s',datefmt='%m/%d/%Y %H:%M:%S')

which results in:

03/25/2022 09:51:28,WARNING,main,<module>,first
03/25/2022 09:51:28,ERROR,sub2,div,error happened: division by zero
03/25/2022 09:51:28,WARNING,main,<module>,done

I tried to do a more pep8 style with this:

        formatter_f = logging.Formatter('%(asctime)s,\
            %(levelname)s,\
            %(module)s,\
            %(funcName)s,\
            %(message)s',
            datefmt='%m/%d/%Y %H:%M:%S')

but it produced this:

03/25/2022 10:01:32,            WARNING,            main,            <module>,            first
03/25/2022 10:01:32,            ERROR,            sub2,            div,            error happened: division by zero
03/25/2022 10:01:32,            WARNING,            main,            <module>,            done

I also tried to set each part as it own variable so i could set a sinlge master sting and keep each var on it’s own line, like

        asctime = "asctime"
        levelname="levelname"
        module="module"
        funcName="funcName"
        message="message"
        date_format = "%m/%d/%Y %H:%M:%S"

        file_format_string =f"%({asctime})s,%({levelname})s,%({module})s,%({funcName})s,%({message})s', datefmt={date_format}"

        formatter_f = logging.Formatter(file_format_string)

When the program ran nothing was logged to the file and this error showed up in console:

TypeError: not enough arguments for format string

Is there a way to organize the logging.Formatter() with each var on its own line or am I stuck with this being a single huge line?

>Solution :

You can use a sequence of adjacent string literals, which will automatically be concatenated by the compiler.

formatter_f = logging.Formatter('%(asctime)s,'
                                '%(levelname)s,'
                                '%(module)s,'
                                '%(funcName)s,'
                                '%(message)s',
                    datefmt='%m/%d/%Y %H:%M:%S')